Dynamic performance estimation of small-scale solar cogeneration with an organic Rankine cycle using a scroll expander

Twomey, B.; Jacobs, Peter A.; Gurgenci, Hal

doi:10.1016/j.applthermaleng.2012.06.054

Cited by 129 publications

(52 citation statements)

References 10 publications

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“…Such an effect is studied by Wang et al [22]. The SORC model expressed is as energy balance between solar cycle, ORC and heat losses as follows: (7) where is the thermal storage internal energy, is the useful heat gain from solar collector, is the heat transfer to the ORC and is the standing heat losses (for a more detailed description of the modelling, see Twomey et al [21]). Considering solar collector performances, the SORC system was designed to be activated at a storage temperature of 120 °C and deactivated at 85 °C.…”

Section: Application: Dynamic Simulation Of Sorcmentioning

confidence: 99%

“…The change of the solar irradiance influences the operating characteristics of the SORC system, such as solar collector efficiency, thermal efficiency and system on/off frequency. A lumped SORC model designed by Twomey et al for studying the relationship between the solar radiation pattern and the SORC response [21] was adopted in this simulation. In this study, thermal storage is adopted, and it stabilizes the system operation from weather variability.…”

Section: Application: Dynamic Simulation Of Sorcmentioning

confidence: 99%

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A Mathematical Model of Hourly Solar Radiation in Varying Weather Conditions for a Dynamic Simulation of the Solar Organic Rankine Cycle

2015

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A mathematical model of hourly solar radiation with weather variability is proposed based on the simple sky model. The model uses a superposition of trigonometric functions with short and long periods. We investigate the effects of the model variables on the clearness (kD) and the probability of persistence (POPD) indices and also evaluate the proposed model for all of the kD-POPD weather classes. A simple solar organic Rankine cycle (SORC) system with thermal storage is simulated using the actual weather conditions, and then, the results are compared with the simulation results using the proposed model and the simple sky model. The simulation results show that the proposed model provides more accurate system operation characteristics than the simple sky model.

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Section: Application: Dynamic Simulation Of Sorcmentioning

confidence: 99%

Section: Application: Dynamic Simulation Of Sorcmentioning

confidence: 99%

A Mathematical Model of Hourly Solar Radiation in Varying Weather Conditions for a Dynamic Simulation of the Solar Organic Rankine Cycle

2015

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“…The evaporator is a heat exchanger with single phase (preheating and superheating) and double phase (evaporation) regions. Twomey et al [91] developed a dynamic model for a solar ORC using a scroll expander. The dynamic model based on first principles showed good agreement with experimental data regarding power output, rotational speed, and exhaust temperature.…”

Section: Dynamic Modelsmentioning

confidence: 99%

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

2015

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Efficient power generation from low to medium grade heat is an important challenge to be addressed to ensure a sustainable energy future. Organic Rankine Cycles (ORCs) constitute an important enabling technology and their research and development has emerged as a very active research field over the past decade. Particular focus areas include working fluid selection and cycle design to achieve efficient heat to power conversions for diverse hot fluid streams associated with geothermal, solar or waste heat sources. Recently, a number of approaches have been developed that address the systematic selection of efficient working fluids as well as the design, integration and control of ORCs. This paper presents a review of emerging approaches with a particular emphasis on computer-aided design methods.

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“…Nowadays, volumetric expanders are present in almost all industry branches. These machines are applied, e.g., in small and medium power organic Rankine cycle systems (ORCs) [11][12][13][14][15] and as pneumatic engines in mining or automotive industry [16]. The general advantages of volumetric expanders compared to turbines are [15] Rolling piston expanders are especially promising for natural gas pressure reduction.…”

Section: Figurementioning

confidence: 99%

Use of Rolling Piston Expanders for Energy Regeneration in Natural Gas Pressure Reduction Stations—Selected Thermodynamic Issues

et al. 2017

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Gas pressure reduction stations are commonly applied to decrease the pressure of natural gas in the transmission pipelines. In such stations, natural gas is expanded in throttling valves without producing any energy. Through the use of expander in natural gas pressure reduction stations, it is possible to recover the pressure energy of the natural gas during expansion, and drive the electrical generator. Possible solutions include turbines and volumetric expanders. However, turbines are complicated and expensive, while volumetric expanders are simple and cheap. This paper presents an analytical modeling of rolling piston expander work conditions when adopted to natural gas expansion. The main objective of this research was therefore a comprehensive analysis of influence of varied sizes of the expander components and natural gas thermal properties at the inlet and at the outlet of the expander, on the expander output power. The analysis presented in this paper indicates that the rolling piston expander is a good alternative to the turbines proposed for energy recovery in natural gas pressure reduction stations.

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Dynamic performance estimation of small-scale solar cogeneration with an organic Rankine cycle using a scroll expander

Cited by 129 publications

References 10 publications

A Mathematical Model of Hourly Solar Radiation in Varying Weather Conditions for a Dynamic Simulation of the Solar Organic Rankine Cycle

A Mathematical Model of Hourly Solar Radiation in Varying Weather Conditions for a Dynamic Simulation of the Solar Organic Rankine Cycle

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

Use of Rolling Piston Expanders for Energy Regeneration in Natural Gas Pressure Reduction Stations—Selected Thermodynamic Issues

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